21036112444 has 6 divisors (see below), whose sum is σ = 36813196784. Its totient is φ = 10518056220.

The previous prime is 21036112439. The next prime is 21036112459. The reversal of 21036112444 is 44421163012.

It is a super-2 number, since 2×21036112444² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2629514052 + ... + 2629514059.

Almost surely, 2^21036112444 is an apocalyptic number.

It is an amenable number.

21036112444 is a deficient number, since it is larger than the sum of its proper divisors (15777084340).

21036112444 is a wasteful number, since it uses less digits than its factorization.

21036112444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5259028115 (or 5259028113 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 21036112444 its reverse (44421163012), we get a palindrome (65457275456).

The spelling of 21036112444 in words is "twenty-one billion, thirty-six million, one hundred twelve thousand, four hundred forty-four".